First of all, the meaning of this sentence is not only a satire on the queen, but also a criticism of the whole court environment. In the story, the queen, as the first wife of the emperor, should have authority and status, but because of her lack of fighting and Machiavellian skills, she was despised and bullied by other queens. What Cao Guiren said is actually implying that people with real strength and ability do not need to make public or make noise, while noisy people are often superficial and lack strength.
Secondly, this sentence also reflects the cruelty of court competition and the distortion of human nature. In the court, the queens attacked and vilified each other by any means in order to compete for the emperor's favor and power position. The purpose of this sentence by Cao Guiren is to tell everyone that those who seem kind and docile on the surface often hide the biggest conspiracy and sinister heart. This cruel competitive environment makes people lose the bottom line of human nature, cheating, hurting and betraying each other. Such a palace life is shocking.
Finally, this sentence can also be extended to thinking about social phenomena. Although Empresses in the Palace tells the story of the ancient court, the power struggle, the nature of competition and the distortion of human nature revealed in it still exist in today's society. People often see that those who say the kindest and fairest words are actually the most insidious and cunning. This sentence reminds us to be vigilant in real life, not to be blinded by the superficial aura, to look at and analyze what is happening around us with heart, and not to be easily believed and used.
Generally speaking, Empresses in the Palace's statement that a biting dog doesn't bark is a satire on the Queen, but at a deeper level, it implies and reflects on the court struggle, the distortion of human nature and social phenomena. This sentence, in a concise and philosophical form, gave me a deeper understanding of the world depicted in the play and also triggered my thinking about human nature and society. By watching this drama, I got a useful reflection on history and reality.